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Re: FullSimplify fails for very large numbers and powers

  • To: mathgroup at smc.vnet.net
  • Subject: [mg89953] Re: [mg89880] FullSimplify fails for very large numbers and powers
  • From: DrMajorBob <drmajorbob at att.net>
  • Date: Wed, 25 Jun 2008 06:26:03 -0400 (EDT)
  • References: <32100556.1214305104042.JavaMail.root@m08>
  • Reply-to: drmajorbob at longhorns.com

(-15050460856003445253967416883354036354022375424000000000000000000000\
00000*(-kth + 2*k*r)^187*(kth - 2*k*r + 6*s*(-2*k*rho + s))^6*(kth -
        2*k*r + 8*
         s*(-2*k*rho +
           s))^6*((k^196*(kth +
            s^2))/(3010092171200689050793483376670807270804475084800000\
000000000000000000000*(-kth + 2*k*r)^187*(kth - 2*k*r +
             6*s*(-2*k*rho + s))^6*(kth - 2*k*r +
             8*s*(-2*k*rho + s))^6) + (k^196*(4*k^2 - 4*k*rho*s +
            s^2))/(3010092171200689050793483376670807270804475084800000\
000000000000000000000*(-kth + 2*k*r)^187*(kth - 2*k*r +
             6*s*(-2*k*rho + s))^6*(kth - 2*k*r +
             8*s*(-2*k*rho + s))^6)))/k^199 // Cancel

(-4 k^2 - kth + 4 k rho s - 2 s^2)/(2 k^3)

Bobby

On Tue, 24 Jun 2008 02:19:48 -0500, Paul Schneider  
<a9408266 at unet.univie.ac.at> wrote:

> Dear newsgroup,
>
> FullSimplify (Mathematica 6 and 5.2) does not simplify the expression:
>
> (-1505046085600344525396741688335403635402237542400000000000000000000000000*(-kth
> + 2*k*r)^187*(kth - 2*k*r + 6*s*(-2*k*rho + s))^6*
>    (kth - 2*k*r + 8*s*(-2*k*rho + s))^6*((k^196*(kth +
> s^2))/(3010092171200689050793483376670807270804475084800000000000000000000000000*(-kth
> + 2*k*r)^187*
>       (kth - 2*k*r + 6*s*(-2*k*rho + s))^6*(kth - 2*k*r + 8*s*(-2*k*rho
> + s))^6) + (k^196*(4*k^2 - 4*k*rho*s + s^2))/
> (3010092171200689050793483376670807270804475084800000000000000000000000000*(-kth
> + 2*k*r)^187*(kth - 2*k*r + 6*s*(-2*k*rho + s))^6*
>       (kth - 2*k*r + 8*s*(-2*k*rho + s))^6)))/k^199
>
> to the much nicer
>
> -(4*k^2 + kth - 4*k*rho*s + 2*s^2)/(2*k^3)
>
> Do you have tips on how I could achieve this?
>
> Thank you,
>
> Paul
>
> PS: the expressions are in InputForm. Somehow the power signs get lost
> when pasting from Thunderbird. Pasting from Kmail seems to work.
>
>



-- 
DrMajorBob at longhorns.com


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